Adelaide self-driving vehicle demo highlights role of V2X communication

Cohda Wireless, the Australian connected and autonomous vehicle technology firm, has carried out a demonstration in Adelaide to highlight the role vehicle-to-everything (V2X) communications have to play in improving road safety.

During the demonstration, carried out in Adelaide’s central business district, the company used two connected cars to highlight how connected vehicle technology will allow vehicles to avoid potential crashes by signalling their intentions.

The self-driving vehicle demonstration, supported by the Department of Planning, Transport and Infrastructure’s Future Mobility Lab Fund, saw the vehicles approach a four-way intersection at right angles to each other.

Car 1, a connected and autonomous vehicle, approached the intersection with a green light showing. Car 2, a human-driven vehicle, approached the same intersection at speed, despite being faced with a red light.

In a real-life scenario, noted the company, a collision would be likely, especially due to limited visibility from nearby buildings or infrastructure. However, V2X technology would allow a connected and autonomous vehicle to detect the potential collision and take action to avoid it.


“We demonstrated that when vehicles are connected to each other using our smart V2X technology, Car 1, the connected autonomous vehicle, would detect that Car 2 is approaching the red light at speed and is probably not going to stop,” said Professor Paul Alexander, Cohda Wireless’s Chief Technical Officer.

“This allows the connected autonomous vehicle to pre-emptively identify and respond to the threat by slowing down and stopping.”

The company also used the demonstration to highlight the difficulties ‘urban canyons’ of buildings in city environments can pose for the accuracy of Global Navigation Satellite Systems.

“Flinders Street in Adelaide is one such urban canyon where positioning through GNSS can be off by up to 40 metres,” said Professor Alexander, noting that V2X technology could improve positioning accuracy to within a metre.

Cohda Wireless has demonstrated similar discrepancies in New York City. There, the company found that GPS-based systems were as much as tens of metres off-course while driving along Sixth Avenue – the street with the city’s tallest buildings – yet V2X technology was able to demonstrate sub-metre accuracy.